Lenovo C315 All-In-One - Manual (Page 33)

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User Guide
7. Zoom Operation
Use two fingers to gently touch the desired item on the touch screen, and while
keep touching the screen, slide to change the distance between your two fingers.
By increasing (or decreasing) the distance, you can perform a zoom in (or zoom
out) operation. For example, you can enlarge or reduce the picture size in Windows
Photo Viewer.
8. Rotation Operation
Use two fingers to lightly touch the desired item on the touch screen, then rotate
in the desired direction. For example, you can rotate the picture which is being
displayed in Windows Photo Viewer.